Bobbin winder for sewing machines



Dec. 7, 1948. s. ADLER BOBBIN WINDER FOR SEWING MACHINES 2 Shee'ts-Sheet 1 Filed Aug. 50. 1946 WW iinw ."Dec. 7, 1948. s. ADLER BOBBIN WINDER FOR SEWING MACHINES 2 Sheets-Sheet 2 Filed Aug. 30. 1946 A TTOR NE KS small overall dimensions; as, for instance,.a

-.showing the same in. elevation;

to the view of Fig. 2, and

. bobbin casing .3.

Patented Dec. 7, 1948 f O C 3 BDBBIN WINDEB. Eon SEWING MACHINES .S olomon KewG ardens, N. Y. mApplication Augu t so, 1946, SerialNo. 693,915

This, invention relates toan automatic bobbin winder for sewing machines. d

Thebobbin winder of the conventional type of sewing machine is drivenbyxfriction contact with It is an object of thisinvention to provide a bobbin winder which dispenses with the usual frictional connection with the balancewheel and, therefore, can be used also 'on machines. DQssessing nobalanceiwheel at all. Another object is to providea means whereby the stitching mechanism is automatically; and safely disconnected upon putting the bobbin winder into operation. A still further object; of theinventiomis:atbobbin winder which is simple inconstruction and or small size so, that. itycan be formed as an integral part, of a completely self-contained machine .of

able sewing machine. t l

These andfurther, advantages willcappear from the fQllQWillg; description of the invention when readin: connection with the accompanying draw ings, of which I Fig. 1 is an assembly plan view ofrthe rbase :pqrtion of. a sewing machine; embodying thel autoinatic bobbin winder according to the invention; Fig, 2 .is a verticalysection through the portion of the machine which contains the bobbin winder,

Fig 3 is a similar section, taken at right; angles Rig, 4 is a sectionon line 4-44 of Fig. 2, showing in afragmentary view the-shaft andsleeve of the thread guide with its associatedfollower member.

Referring to the drawings and, in particular to Fig.1, it, will seen that the machine has amain drive, shaft Lfor roperationof, the feeddog {and A similar shaft. .is located. in l.

the upper portion ofthe machine,- which isnot shown .in the drawings, and. an appropriateiverticalshafting will establish; :the connection between the two drive shafts, through theintermean of bevel gear 44; l l The machine istoperated by a small electric motor M. A transversegshaft 4. providesthe connection between the drive shafts and the motor.

."secured to; this shaftyby; a feather hey is anbushring, .5 .ontwhich a; bevel gear {6n idisposedrzfcr 1a permanent mesh with the bevel gear 1 of the motor. By means of the feather key the shaft is lengthwise slideable Min the bushing but is coupled toit for rotation. The shaft, at its forward end, carries a bevel gear 8 for engagement of a mating gear 9 which is disposed on the drive shaft. It also is provided with a bevel gear I0 which is oppositely disposed to the .justmentioned front gear .8. and which serves as a com neetion to the gear and shaft 1 I of a' threading devicetwhich is, not further described and is not claimed herein. d

The bobbin winder proper is containedin an exterior; alcove of the frame which is. formed by "wall portions Hand l3 and a door -like closure wa-ll IB of the frame by screws and is lengthwise .Qfliftable onsaid rear wall 1 in. slots I! (Fig. 2).

The carrier. member is bent at right angles so that-its. portion l.5a projects transversely into the machine, providing a seat for two shafts I18 and J9. Shaft, 18, is adapted to carry the bobbin wduiging lthe windin Operation. It pierces the carrie emberandfhas an outer slit bobbin re ceiving end, Z BQand carries at this inner end, a bushing. 21 .and 'a bevel gear 22 for engagement of, the bevel'fi. of the transverse shaft.

" The other shaft carries a thread guide 23, and is drivenby theibobbin shaft through spur gear 2.4, and pinion 25.. This second shaft is provided wa left and right hand thread and a sleeve 2 6 .to whic:h the thread guide is attached.

As appears best from Fig' 4, the sleeve is ,piercedby. aisrnall spindle 21 which extends perp ndicular to th'esl'iaft and is rotatably seated in -sary clearance for oscillating movements of the e ve- .It..W.ill rbqappreciated that, by means of this follower,areciprocating movement is imported -..to theisleeve whenthe threaded shaft is rotated.

Preferablxithe ends of, the follower are curved inwardly towards the thread. This enables the follower to form a sliding fit in any part of the .glYOQi/e of, the left andright hand thread with- .uut bec oming wedged at intersecting points. 'Ihe p openen gagement with the, intersecting grooves is; further facilitatedfbyf the rotatable seating of thefollower andtan easy switch from one groove to theother upen reversal of the operation, is

thus assured.

Parallel wit-h the bobbin and thread guide shafts extends a third shaft 30 which slides in a tube 3| mounted on a bracket 32 of the frame. The latter shaft provides the holding element for the spool from which the thread is unwound in order to be rewound on the bobbin. The shaft s under action of a spring 33 contained in the tube 3|. The spring tends to push the shaft outwards into the slotted line portion of Fig. 2 when the door-like closure M is opened. A recess 34 in an upstanding arm 35 of the closure provides a stop for the movement of the shaft when the door is closed and keeps the shaft within the confines of the frame.

The door has a connection to the angle carrier through pivot links 36, 31. The linkage is of a type wherein the direction of the motion is reversed. The carrier is, therefore, pushed inward when the door is opened and is slid outwards when the door is being closed. Another linkage 38, 39 connects the carrier with a forked coll-ar4ll which is disposed on the extreme rear end of the slide shaft. The latter linkage is so arranged that, upon moving of the carrier to the right, the shaft is slid to the front of the machine and vice versa.

The device operates as follows:

Opening of the closure [4 exposes the three shafts of the bobbin winding mechanism for operation. The same movement efiects a shifting of the angle carrier 15, I5a and of the shafts supported in it towards the interior of the machine. This brings the bevel 22 of the bobbin shaft into engagement with the slide shaft. The slide shaft 4 simultaneously is moved slightly to the rear of i the machine by means of the linkage connection 38, 39 between the carrier and the clutch collar 40, which rearward movement brings about the disengagement of the bevel gear 8 and its mating gear 9 on the drive shaft of the stitching mechanism.

It will be appreciated that in this position the bobbin winding mechanism is ready to be engaged by the motor while the stitching mechanism is out of engagement. The bobbin is then placed on the bobbin shaft [8 and a spool of thread is put on the spool holding shaft 30. The thread is thereupon passed over a tension device 4| of conventional form, thence through the thread guide 23 and into the bobbin. T-he reciprocating motion of the sleeve 26 and thread guide will assure an even winding of the bobbin and a smooth running thread.

' In order to start the motor, the machine has a rheos-tat starter switch. The rheostat is indicated at 42 and its scale at 43. The rheostat permits to regulate the speed of the winding and, if desired, to have the winding performed at the highest speed which can be accomplished by the machine. 7

Once the winding operation is completed, the door is closed after removal of the bobbin casin and thread spool. The closing of the door effects an outward sliding of the carrier member and, therefore, a disengagement of the bobbin shaft and simultaneously a forward sliding of the connecting shaft resulting in a rte-engagement of the stitching mechanism.

While I have described one embodiment of my invention, it will be manifest that a number of details are open to modifications which would not constitute a departure from the spirit of the invention. I, therefore, do not wish to be limited otherwise than by the language of the appended claims.

oted to the frame of the machine, and a linkage connection between the said closure and the said carrier member whereby the latter member is shifted upon moving of the closure so as to bring the said two shafts into relative engagement and disengagement.

2. An automatic bobbin Winder, constructed in accordance with claim 1 including .a lengthwise slideable arrangement of the drive shaft, a connection between the drive shaft and the stitching mechanism of the machine, the latter connection being disengageable by said lengthwise sliding of the drive shaft, a clutch collar, disposed on the drive shaft, and a linkage connecting the said clutch collar and the carrier member whereby opening of the closure and the consequent shifting of the carrier member also effects the lengthwise sliding of'the drive shaft and thus the disengagement of the stitching mechanism.

3. In a sewing machine, an automatic bobbin winder comprising in combination, a "carrier member shiftably secured to the frame of the machine, a shaft mounted in the carrier member and adapted to hold the bobbin, a drive shaft for-transmitting .a rotary motion to the bobbin shaft, 2. disengageable connection between said two shafts, means to actuate said connection by shifting the carrier member, a second shaft mounted in the'carrier member and having a left and right hand external thread, a sleeve carried by the said second shaft, a follower member secured to said sleeve and adapted to engage the left and right hand thread for transmitting a reciprocating motion to the sleeve, a thread guide carried by the sleeve, means for transmitting the rotary motion of the bobbin shaft to said second shaft, and a holder for a spool of cotton, the thread passing from the spool through the thread guide to the bobbin disposed on the bobbin shaft.

4, In a sewing machine, an automatic bobbin winder comprising, in combination, a carrier member shiftably secured to the'frame, a shaft mounted in the carrier member and adapted to hold the bobbin, a drive shaft for transmitting a rotary motion to the bobbin shaft, a disengageable connection between'said two shafts, means to actuate said connection by shifting the carrier member, a second shaft journaled in the carrier member, said latter shaft having an endless left and right hand external thread, a sleeve, carried by said second shaft, a follower projecting internally from said sleeve, the follower being rotatable about an axis perpendicular to the axis of the sleeve carrying shaft and being of a form adapted to engage the groove of the intersecting threads, a thread guide carried by the sleeve, means for transmitting the rotary motion of the bobbin shaft to said second shaft, and a holder for aspool of cotton, the thread passing from the spool through the thread guide to the bobbin disposed on the bobbin shaft.

5. In a sewing machine, a bobbin winder constructed in accordance with claim 4 wherein the follower member is provided with an arcuate contact face, with ends curving towards the said threaded shaft, for sliding engagement with the grooves of the thread.

6. In a sewing machine, an automatic, bobbin winder comprising, in combination, a carrier member shiftably secured to the frame of the machine, a shaft journaled inthe carrier member and adapted to hold the bobbin, a slideable drive shaft for transmitting motion to said bobbin shaft, a disengageable connection between said two shafts, thecarrier member being adapted, upon shifting, alternatively to engage and disengage the said connection, means to effect the shifting of the carrier member, a shafting for transmitting motion to the stitching mechanism of the machine, a means disposed on the drive shaft for connection to the said shafting, a linkage between said carrier shifting means and said slideable drive shaft adapted to effect a simultaneous shifting of the carrier member and sliding of the drive shaft, so that, when the bobbin shaft is brought into engagement with the drive shaft, the latter shaft is disengaged from the shafting of the stitching mechanism.

7. In a sewing machine, an automatic bobbin winder comprising, in combination, a carrier shiftably secured to the frame of the machine, a shaft journaled in the carrier and adapted to hold the bobbin, a drive shaft for transmitting motion to the bobbin shaft, the two shaftsbeing adapted selectively to be brought into engagement and disengagement by shiftingof the said carrier, atubular member secured to the frame, a spindle adapted to hold a spool of cotton, the spindle being slideable in the said tubular member, means forcing the spindle outwardly, a closure for covering the outer end of the bobbin shaft, said closure being pivoted to the frame, an abutment for the outside end of said spindle, disposed on said closure and adapted to force the spindle into the tubular member upon inward movement of the closure, and a linkage connecting said closure to the carrier. adapted to bring the bobbin shaft into engagement with the drive shaft upon outward movement of the closure.

8. In a sewing machine, an. automatic bobbin winder comprising in combination a shaft for holding the bobbin, means for engaging and disengaging said shaft with a source of motive power, a movable closure member for covering the bobbin holding end of said shaft, and an operative connection between said closure member and said power engaging and disengaging means, whereby the latter means are actuated upon moving of said closure member.

9..In a sewing machine, an automatic bobbin winder comprising in combination a shaft for nection between the said two shafts, a movable holding the bobbin, a drive shaft for transmitting motion to said bobbinshaft, a disengageable conclosure member for covering the bobbin holding end of said bobbin shaft, and means operatively linking said closure member to said disengageable connection whereby the latter is actuated upon movin of said closure member.

10. In a sewing machine, an automatic bobbin winder comprising in combination a. shaft for holding the bobbin, 2. drive shaft for transmitting motion to said bobbin shaft, a disengageable connection between the said two shafts, a pivoted closure member for covering the bobbin holding end of said bobbin shaft, and a linkage connection between said pivoted closure member and said disengageable connection whereby the latter is actuated upon moving of said closure member.

11. In a, sewing machine, an automatic bobbin winder constructed in accordance with claim 9 and includin an auxiliary shaft having a left and righthand external thread, a sleeve carried by the said auxiliary shaft, a follower member secured to said sleeve and engageable by the left and righthand thread for transmitting a reciprocating motion to the sleeve, a thread guide formed on said sleeve, and means for transmitting motion to the said auxiliary shaft, whereby the thread guide is adapted to pass the thread to the bobbin and to permit the winding of a bobbin of substantially uniform thickness.

12. In a sewing machine, an automatic bobbin winder constructed in accordance with claim 9 and including an auxiliary shaft having a left and righthand external thread, a sleeve carried by the said auxiliary shaft, a follower member projecting internally from said sleeve, the follower member being rotatable about an axis perpendicular to the axis of the sleeve carrying shaft and being of a form adapted to engage the groove of the intersecting threads, a thread guide carried by the sleeve, and means for transmitting the motion of the bobbin shaft to the auxiliary shaft, whereby the thread guide is adapted to 3 pass the thread to the bobbin for obtaining windings of substantially uniform thickness.

SOLOMON ADLER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

